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|
jsonString = String.trim(File.read!("inputs/day12.txt"))
numberSum =
Regex.scan(~r/[+-]?\d+/, jsonString)
|> Enum.map(fn [numString] ->
{num, ""} = Integer.parse(numString)
num
end)
|> Enum.sum()
IO.puts("Number sum: #{numberSum}")
defmodule JsonParser do
def sumNonRedNumbers(<<"{" <> rest>>) do
[{:end, redStatus, sum, rest}] =
Stream.iterate({:open, :not_red, 0, rest}, fn {_, redStatus, sum, rest} ->
{endNow, newRedStaus, subSum, rest} = readObjectContent(rest)
{endNow,
if newRedStaus == :red do
:red
else
redStatus
end, sum + subSum, rest}
end)
|> Stream.filter(fn
{:end, _, _, _} -> true
_ -> false
end)
|> Enum.take(1)
sum =
if redStatus == :red do
0
else
sum
end
{sum, rest}
end
def sumNonRedNumbers(<<"\"" <> rest>>) do
[_, rest] = String.split(rest, "\"", parts: 2)
{0, rest}
end
def sumNonRedNumbers(<<"[" <> rest>>) do
[{:end, sum, rest}] =
Stream.iterate({:open, 0, rest}, fn {_, sum, rest} ->
{endNow, subSum, rest} = readArrayContent(rest)
{endNow, sum + subSum, rest}
end)
|> Stream.filter(fn
{:end, _, _} -> true
_ -> false
end)
|> Enum.take(1)
{sum, rest}
end
def sumNonRedNumbers(numberNext) do
Integer.parse(numberNext)
end
def readObjectContent(<<"\"" <> rest>>) do
[_, rest] = String.split(rest, "\":", parts: 2)
case rest do
<<"\"red\"" <> rest>> ->
{:open, :red, 0, rest}
_ ->
{sum, rest} = sumNonRedNumbers(rest)
{:open, :not_red, sum, rest}
end
end
def readObjectContent(<<"," <> rest>>) do
{:open, :not_red, 0, rest}
end
def readObjectContent(<<"}" <> rest>>) do
{:end, :not_red, 0, rest}
end
def readArrayContent(<<"," <> rest>>) do
{:open, 0, rest}
end
def readArrayContent(<<"]" <> rest>>) do
{:end, 0, rest}
end
def readArrayContent(json) do
{sum, rest} = sumNonRedNumbers(json)
{:open, sum, rest}
end
end
{nonRedNumbers, ""} = JsonParser.sumNonRedNumbers(jsonString)
IO.puts("Non red number sum: #{nonRedNumbers}")
|
